Masquerade Night

As evening falls, you both get ready. You, in a gentlemanly suit and your partner dressing as a sensual enchantress. The highlight of your outfits being the masks that will add the mystery. You meet in your own version of the grand ballroom, which could be your living room itself. Lights dimmed, slow romantic music in background and both of you lost in each other's eyes.
Your eyes meet across the room, and though you'd recognize those eyes anywhere, the mask adds some extra allure. You swirl, twirl, and tango, letting the rhythm carry you in its throbbing embrace. As the evening progresses, the intrigue increases. Underneath the mask, stolen kisses are exchanged.
The dance slows down and the evening heads towards a night of mystery and passion. The night filled with a lot of holding close and whispering sweet nothings. The mask stays on, heightening the allure and anticipation.

To prepare for this scenario, you would both need to get a masquerade mask and dress up in your classy best. Create a playlist of some smooth, romantic music that can be danced to. The focus should be on creating a romantic and mysterious ambience. Dim the lights and set the mood by using candles for soft, romantic lighting.
You could plan a fancy dinner to go with the theme. Or simply some wine and hors d'oeuvres to nibble on while dancing. Another way to make the night more special could be by writing love letters to each other, adding your own vows or promises. Either way, it should be an intimate affair between you two, with the focus being on romance, intrigue, and a shared connection.
Remove all distractions for the night, turn off your phones, forget about the outside world and get lost in each other. Also, be open to improvisation and surprises. Keep the mystery alive throughout the evening!

Remember, the whole point of this scenario is to create a sense of excitement and mystery. The masks should be worn at all times to maintain the feeling of intrigue. Extend this mystery to your interactions as well. Speak in whispers, flirtatiously avoid direct answers and keep your partner guessing.
Try to stick with the theme of a masquerade ball. Stay in character for the evening. Speak in a certain way, act in a certain manner. This could be a great way to explore aspects of your personality or fantasy you don't usually express.
Last but not least, communicate your boundaries with your partner. Make sure that both of you are comfortable with the scenarios that you are enacting. The idea is to spend a lovely evening together, where both of you are comfortable and enjoying the scenario.